fix(bot,ui): defer bot actions past throttle, fix CardKB lock bypass, add !gps fix timeout arg

- Bot Actions (!buzz/!gps/!advert/!gpio1-4) ran their side effect
  immediately during botScanCommands(), before quiet-hours/cooldown/
  per-contact throttle were checked -- those gates only suppressed the
  reply text, not the actual buzz/GPS toggle/advert/pin write. botCommandReply()
  now only records what was requested; applyPendingBotActions() runs the
  deferred effects once a wrapper's throttle checks pass and the ack sent,
  mirroring the existing _locfix_requested pattern. resetPendingBotActions()
  clears everything on every throttled/aborted path.

- CardKB's Fn+<letter> accent-popup shortcut bypassed the locked-input gate
  (it called into KeyboardWidget directly instead of through the
  enqueueKey()/dequeue path every other key uses, so it wasn't discarded
  while _locked). Now checks _locked itself.

- Since a locked device now correctly ignores CardKB entirely, Fn+Esc
  (single press) is added as CardKB's own lock/unlock gesture -- otherwise
  a CardKB-only setup had no way to unlock. Esc rather than the adjacent
  Fn+Backspace, to avoid an accidental press.

- botScanCommands() now parses up to two arguments per command instead of
  one. Used by "!gps fix [seconds]" to override the default 90s timeout
  (clamped 15-300s) for a poor sky view where 90s isn't always enough to
  reach isLocFixReady()'s HDOP/satellite bar.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/solo_features/screen_lock/screen_lock.md

@@ -16,15 +16,17 @@ Screen lock prevents accidental keypresses. While locked the display turns off a
 
 **Hold Back** and press **Enter** three times within 3 seconds. The sequence works in both directions — the same combination locks and unlocks.
 
-If the display is off when the sequence begins, it turns on automatically so the hint is visible. Each press in the sequence extends the display-on timer by 5 seconds.
+On boards with an optional CardKB (I2C keyboard) attached, a single **Fn+Esc** does the same thing, in either direction — no repetition needed, since Fn+Esc is already a deliberate two-key combo. Esc rather than the adjacent Backspace, since Fn and Backspace sit right next to each other on CardKB's layout and would be too easy to hit by accident.
 
-The hint popup at the bottom of the lock screen guides through the sequence:
+If the display is off when the sequence begins, it turns on automatically so the hint is visible. Each press in the physical sequence extends the display-on timer by 5 seconds.
 
-| Step           | Hint                  |
-| -------------- | --------------------- |
-| Not started    | _Hold Back + 3×Enter_ |
-| 1 press done   | _Enter ×2 more…_      |
-| 2 presses done | _Enter ×1 more…_      |
+The hint popup at the bottom of the lock screen guides through the physical sequence:
+
+| Step           | Hint                                                        |
+| -------------- | ------------------------------------------------------------ |
+| Not started    | _Hold Back + 3×Enter_ (_Back+3xEnter/Fn+Esc_ with CardKB attached) |
+| 1 press done   | _Enter ×2 more…_                                              |
+| 2 presses done | _Enter ×1 more…_                                              |
 
 If no press is made for 3 seconds, the counter resets.